The question mark is a punctuation mark that is used to indicate a question.
The question mark is: ?
- Common question
- What is your name?
- Do you speak Italian?
- Question formed of a noun phrase
- The black cat?
- My son?
The question mark is used at the end of a sentence to indicate that the sentence is a question.
A question normally has all the elements that any common sentence has: subject, verb, complements of the verb. However, it can also be formed by a noun phrase, that is, a phrase whose main element is the noun and the rest are pronouns, determiners or complements of the noun.
External link to Question mark exercises (1179).